Final answer:
Hair shaping services like perms and chemical straightening alter hair's structure through thermal or chemical means, set in forms to curl or flatten for straightening, all within a context of cultural significance.
Step-by-step explanation:
The procedure criteria for a hair shaping service, such as perms or chemical straightening, involve the application of thermal or chemical treatments to alter the hair's structure. The chemicals are first applied to the hair, which is then set in forms or flattened; this process defines curls or straightens the hair, respectively, during the chemical reaction. Not only is this a technical process, but hair shaping is also culturally significant across societies, often representing religious affiliations, social status, or pop cultural trends, such as the wearing of hijabs in some traditional Muslim cultures.
It is essential that professionals carry out these treatments considering the individual's hair type and desired outcome, using suitable products and techniques to prevent damage to the hair. Aftercare is just as critical, and stylists should advise clients on how to maintain their new hairstyle and ensure the health of their hair following the service.